<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link rel="stylesheet" href="./一般性方法.css">
</head>
<body>
  <div class="szx b1">
     <h3></h3>
     <div class="s1 a1"></div>
     <div class="z1 a1"></div>
     <div class="x1 a1"></div>
  </div>
  <div class="navigation b1">
    <h3></h3>
    <div class="z2"></div>
    <div class="y2"></div>
  </div>
  <div class="sz3x b1">
    <h3></h3>
    <div class="s3 a1"></div>
    <div class="z3">
      <div></div>
      <div></div> 
      <div></div>
    </div>
    <div class="x3 a1"></div>
 </div>
 <div class="szx4 b1">
  <h3></h3>
  <div class="s4 a1"></div>
  <div class="z4">
  
    <div></div>
    <div></div>
    <div></div>
  </div>
  <div class="x4 a1"></div>
</div>
</body>
</html>